<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>简单的下拉列表</title>
</head>
<body>
<form>
  <select name="cars">
    <option value="volvo">Volvo</option>
    <option value="saab">Saab</option>
    <option value="fiat">Fiat</option>
    <option value="Audi">audi</option>
  </select>
</form>
</body>
</html>